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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2810daa0ee9ff11c46986b83f78554c0e651bd52f246c8a367652ce18619eefc' 
  AND token = 'qCdeY6HQrMPSQJ17D2k6P/6rCLjSio/aMM2/rViVEBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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