Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e61a62f4ba467c23e5935faaafde6d9fc39a95bbdceec46e3030859f2cf7e592' 
  AND token = 'KKkXkjQ7ke6YEo1wlhUoljvkNS0m10PZe6wyFjeIzHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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