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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '60cf401c83185cc824708a686bbeca56d6155e37c4040a257fa4f2b330431521' 
  AND token = 'Hbmblj4A0ZU69uPdko+1ovZ1MujyS4Qi8D3jbbRJV64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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