Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7d6bba2a0f69270c49263bfb66d9580fc8ecacad8011c4caae2fe906d23b733' 
  AND token = 'kYpTcZ1+3wdT2vzR3MHAoHVjr6blcBg0Vhe9dONa9Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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