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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bfe6919b592107ec43d923e465022f19e4b93b8e1ae50ecc42a888fed9114853' 
  AND token = 'JHdhOSUe2d+zHoguaKZKnSZMpmYE+0OQCAE9pvCl3aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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