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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ae64a38a5a0a7c3e71087ea06d161b7e69608913576f73c8832dcfc17174b223' 
  AND token = 'iBhZRUC1jzM4wQ+40JNE81ht/rDaojKaY29xZj84F7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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