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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c52f3702038db85f0daa2aafb0688f81a2757fd9690270ca897cc251da668f39' 
  AND token = '8X9K7GQLifkoTDkyCI8R/ntgPN+yW00GwGH29nNkz6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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