Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '405b4d222a75c3bd920740cc319e6aa96cdd4e1642c1c2c2153a052ccca63703' 
  AND token = '99BoarM8JTWNiOwge8ypIQXgPYZAnrQXrdWbdVF7kwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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