Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dcce3f137453ca29633dfc5b04464c20e3c50bd0f9ee692dd21c46cec5a9ace' 
  AND token = 'bHBgfq558ZEyHnktGWmfDmveK+pPgGKrfQgYTuBNDVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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