Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e31dceccb9ed9e96ef0feca1d54199409517415288d53927672a7caeddda254a' 
  AND token = 'PrUPuF25PfaE4W3KxsoKITBF6cuk38FnhB2AfMA1CMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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