Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f21d1417d19797e8545da6f1d905ad781a15cb3a68fa8a7c56565aeecf44309' 
  AND token = 'UmOVXtXeLLhwJ+KQ0VudTT7O3sdOk26u0ORJ2xWryz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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