Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '339346d3cda0df99505e420614bd064de37f069c5c39843df8d0afd068be1e0d' 
  AND token = 'vWe/9BtbK7AhU8axNnKiHqkqh3ecwxcxhJctfEsCwOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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