Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fbebe19dfd6719911d9dd9a3931e069738821147b2ecb7e22ba339e2a335c94' 
  AND token = 'lHYr2JLuL6q0+wK5JJ27/IkXD9n39aR/gTtZvggB/N0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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