SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '462668f901c0af1c5ad078da9515cfe1b48abe4eb426bd125273a81dec796989' 
  AND token = 'pWcCthwxSU2iPO8Yvpz9WJ+0KDygZlduvGMZ8qEMEPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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