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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'eb6b56f1cca5ea7ffa036a269d7cc133347bed8e46599aba8723eed2680c13a1' 
  AND token = 'TDg0DCTX1XXfGb1yhHWqyN4Qwnd54+cGRezCAecU9gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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