Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15b8146b52347e5532b5b479c42d82c53a8a94c9e9db797eea7af7a116ba3a70' 
  AND token = '1ipAwxhW1864cRSuZAd7dlPMpma+o35GF3b+Y6lohkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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