Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3e33cc713314d8093356651509e4255cfcd430241b02b567a63752f32363f87' 
  AND token = 'QJw46CfbldQJFRMzuyUeBJmomKrkNtKAh1yBAMjUkvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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