Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef898419e5ec00c2e71952bad904378ba12a0d9741295bc32b76b76aa6e8bac7' 
  AND token = 'M6Nkgkb40jcxslM+Z0+vx9EsUnGsLuKm7brGYo82XJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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