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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c8fcf0dd3707da704c349c03b6c09461be7222ba542e79cb52fc04b8ec7de660' 
  AND token = '3hyDVljzHlFe21Q+M8IcXhM3wzvtlSrHASWUwS2VWuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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