Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2461d024fd45b6786faea4994f4f1dbcf44d1ca370c38b67bc2ab10040c8cba' 
  AND token = 'N4kyhZHeycDYgMs3uhxM2+TZlD5t0+MZgDRRbC1Kg7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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