Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc391b2e6d10f14b1c01792f0c58b6a8ecd7aefbcea22b5b7a1d4e6215b3c132' 
  AND token = 'uWrMsNxYov/4EIc1oBwLwxMNayCML379T/CvyN+hbFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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