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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '003d233b6170f4eb3e437859bdd1a61bca3addcaa09e39ac138e05bce34b179b' 
  AND token = '0WELGs8DK9dpBH/0l5S25WkSXWrkeFiu+eVBINk+zNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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