Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a2ba0b4449066934e4782a4b96f9ddf65e6dfcbc9b8628dddfe514993a31452' 
  AND token = 'BGpwkJL72dh1FIJ4TELb85fiTAyIcjTcGdqY2VP2Ycw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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