Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6202946b63bb39895af9c1977ad3026ee732d903e7436651a6dbca9ab55735c6' 
  AND token = 'rQZIxv1zYYOIi7DIcEqtpqL5sSQlCAf7e/58RURo31A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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