Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2304012ba48beb95862bd75a15f84707f3b7a476dbf7bdda9652ff91acbed8aa' 
  AND token = '78U/Q8HRrITvgHSPrP5qYoFhVXLQi22fHEmsNi3qauc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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