Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eba91a4c672006640be0b3daddf1ffd41dd9476caf76e37a2f451b8f3d6c71a4' 
  AND token = 'kbl/oOIYp3XfCZYriG8li7uB31OD5PRmiSepCyGN1PI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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