Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6a5c4c11c10abafff58948bcaf9d5515d5f49c470a40bdb6fe38b8b1ae22848' 
  AND token = 'U29zZqloBFkidJo5icp4GiZlEyFJZcl18RyDvBAvU7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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