Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87cfc44c05c64cc1cb320eb24e7bc01f5cffa30d9113cf3cd23d99bf2728c72d' 
  AND token = 'mgS2F/ggoNWgRSmEHCfCJBOfqrGji9PiiQjYeZvY8ZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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