Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '888149cada10627ed04ae88d7039b87e30e733a7da75f07e635e3ed268339751' 
  AND token = 'f7HBdjuHDyXiQoEtpwPSz1XvHmbNmeHqFHg1cA/QGBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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