Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e62d39f9ac9aff31fa57d25c2af946b51aa90534b9dd6ed29fae3f1d953b4e75' 
  AND token = 'b8ai+NQpzRF4duHTvsHI6/yqxmb9WOcrGZb3/CAIh50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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