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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b4df161db8d3cc47bde5de499607af705b6ee6332eb3ad9536af7ce599794849' 
  AND token = '6AoH1qRFD14nxTx4gl0Oj/mHegEz3v1xEYiTCbw81FE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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