Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '457443eb99395192391a677355707ffd964cf8545f40ef78c6279fd1535a754e' 
  AND token = '36RckDY4OPhJZJTh0okRWJ7pN0DVKpBfXnoQZVda83E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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