Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '726d08bf2da996295af2eb4300d5cc40ba6f93996f6cec3530fb24acecbdfd80' 
  AND token = 'ZlMdJ7AFXGLWpVjhD5mx1jMFlGXzaCYzUjEYy04nCE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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