Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8686f23a74eb2c9e14e455923c4983bdd1533401a4f245c0b615470739ecf78' 
  AND token = 'WP9RTy2CxkZdb4olFDYn2GmJMiOsem5DdFwiS/4wNkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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