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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c77c3799470e41aeded6ae0e92889170ba04794ee1c391458c607bba65549444' 
  AND token = 'ssIYoLAQtRoPYhOtX5Udt6+/uGMGExdG9R7teZkN+Bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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