Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f79b4c11cddc9efdd17d317eeee76f909e442d568f2792c1b9ff74a55a64f29' 
  AND token = 'kOx89bl4PzjAD2Kpp88FY6lCQRJLVXTub4Ckiqw5d5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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