Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dd0228646e468cbcb7fdbc0c37d8d0abb925eded91dfaada124090843eda78f' 
  AND token = 'w4UwTDYSjmRFzFCaz6J4CyqSg9jK+3Nte6O0EJQdbuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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