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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'de83847ce2d3a3f4a4867065046bcf6b3cc833fbf6a28114677e28b455d64642' 
  AND token = 'Q/fRw83iH02Qpy7wA+xNxdwGrt2iTkZD2hDB6z+M9Rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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