Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef9dee56b7b91b6461ced9273ca6eea9f18405964420e0c5d78b16cd9bd0b0d0' 
  AND token = 'R/hZznr8Siev6End6nDKbhmkR+bW9y0/9Xz8Q7Q9Mqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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