Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7ef30c1def822c8c7a0fbc2cae8e7a615446218ce7deb068d7b8a53db40e336' 
  AND token = 'XgOvZClQx0q5Jr4NZCrILnYwr4xvzQxTfA/jD42d63g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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