Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c74bf848882530b6e1db28f3c1091410f4742b210bdfc00bb4e488c2010d9182' 
  AND token = 'Za560PAtyk1MKtmXq6IZuG3raRuMYKZnia3FahEFjjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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