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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a74b33c4df18804437b21e119b3016b53583cbd2d5b136e690fc64a74d27446a' 
  AND token = 'IMW/Bjnd+7C0O/IJ8Gyf43df9Pd33wNaqRNHDy9FTIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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