Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bb5b1d8242ef05222414fb46ad252c44a491bf258156be9a90d32b8f2fbe257' 
  AND token = 'Dg3p5iQv/Z/TDNUa6Pl85bim1iw1jhIUz9MmYycacVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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