Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52718b52571abdee8678efff810fda8a164e1378309b1fb05c47490d22095c99' 
  AND token = '9fxLCPtZKYBH/iTZI5151iVEo7yyJyyNGQSOaQ8+SKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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