Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c8a0e879903a9ff6a160210937a8241efe5ab802824dd8b220a783ae5583c85' 
  AND token = 'UoL9MqaqjEEEt3jzjmindFjV4mitntZ+F717aoGFJKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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