Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1b0d391fb14d04411cb865dea79cb4d218c54a2932866d295e301f39ab3b3cc' 
  AND token = 'RXsm8YJaxT0cygr3OD3EGQg4yf+Uhj7qOw4orv8xmkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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