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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '575d67b9346e8ad63d95b6eecddfcf1169584983b677b8f8368b41a6ad3d096b' 
  AND token = 'cJFGiwMo5X0MoVMzJeN8NSTc3yjfHIq6cPwmDuUJxuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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