SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '860aaadd4a1b4ad95bf53530b41969a5b121214bd7639cfd67e8516e716fe50f' 
  AND token = 'waY86fa50HRKnMbv3F7Y+SPBLs8uCM0GY7f/SMZBMlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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