Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '473d954598ab86b07af38dd3bc8781276efe829221ef84e7c627306b6e62e2bf' 
  AND token = '9+idSosjzH6vJ8eWeq7+c6cXGDOCppcYxXf88czkKw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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