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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3df1f66ccebbcd20fee46dd2446ad2b9ad75f26ed605359ab8e174b6a42f9b1d' 
  AND token = 'nW7L9vW8amze2YbenfGDf/utxYPvPx/28N7PdvYnmlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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