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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7015e4c0bb2f4e67a1b8d0ed2f5b46307a410f6872bf11173117b247b9ffb21c' 
  AND token = '9s3rg4F3W4zAy0gJpCPWP5k2TJUIy+f47Qy0GDlg0zU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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