Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '639a3731d475efebdca798741c53fa77d637c366d671ce047b831918735cfd19' 
  AND token = 'lt7hszHaHC0HeRlPVYwKzPKYggKX3S3fARoJNGX8aQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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