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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '34d47151d3583e098ecb7834172a57716e382b08b79c3a655ab8b5fa288e4aab' 
  AND token = 'yeOSTlqWti2ScRFlNprZ3iROy2+YPyzAVdNOVEmuX1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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