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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd3e27b071e870a357d7d96574976baae60ffdc93b59f7f7883c3081738efe02f' 
  AND token = 'et3ZzXn7f4c1padrtfuSAF8y7mQ375ZhTidoeTGxiNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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