Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18d94717ad9ff2df8027ce0c44be2b997b7686504e8be60ba2b15a4695ff21df' 
  AND token = 'bdgi39mhFoaAf7murc2zfa14h1wR9RbUr+1ntNOevN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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