Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d1b7d8de7b8499e634c1dc28ea9d57656f1d25ece9fd3e2e7ce480730c58b9d' 
  AND token = 'DKDdA6M9a7DMb7sMwVg6fv4orj7TOTbYSAD3YBfLvFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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