Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ffadea3a76a13b888096d5ecb36bdc014123cc7d5a79ebc4c0706d55cfe8bb4' 
  AND token = 'WNo0rlTWmm0ufcaZD6W6dF+XjvvvkM9A78x4sjMYamY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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