Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b821f78a44b35ea8009f2aebb3a118937b112170779b23bd7c4b5b0f9fb4b61d' 
  AND token = 'Fo8xHwb/nBvUWfpXgzpMx8ccHwC/frYNTXT18YBhBzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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