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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f2dc3eba149e083d5df4f8843a82b19dc71c8f8ac9a5a383cbfcd69c7002146f' 
  AND token = 'HqwPnKm/kp322EwzxPuFbVla/jxkdctLl91FwYMc4Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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