Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79802cf29974de3c9548cad17bfd8436f8d0e09054913675abe7aac8233c541a' 
  AND token = '+VYq+8UVO2kLcRrDt80vbIRwU9l9EqDIdrlRUoNOnAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}