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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5ca63e2a2e5d7a07a4d606261560ebe4b7043ce1c63988a93017f421d3d8f1b4' 
  AND token = '7bDZJL5tq4ok3PsRKUnXoqSGkbx+STqAJrxk3Rgtk7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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