Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '790e27b44549df3bf224024ad30f5a54aa8efdf0313e752e9d53d8bd49bfea5b' 
  AND token = 'RxXbCzcqgS7ZO8H9RDEhlKfeZiPXLwedPzoF3Pt5ocA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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