Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0b34578474377e09b5af2f50378064e58987ca14c4ea65f33f1a19f0a7514b7' 
  AND token = 'mUumfRW1xX/5SFQTSlUy/2/yG5R3PMUzCvL1MmPibR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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