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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '41474e58c3968b26611df2057708ad2cee1f1b80c2ee64fb18df35db56dd89b3' 
  AND token = '0x2MqCzO/7WHuvom1E5FfIXWK2UwO+0WJIALyV6Rt1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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