Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf347219062848ef581fe4c87df28947d688bf6a3048e471985aeb315cf7847c' 
  AND token = 'ytdBfEpeQUiMXL6egQEI7kU/lNwVivgmCcSmNYll6JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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