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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '31497c71bd2231efd3bf1ff3e1ed336d7a020bd5ee0171f63422c411cab958b4' 
  AND token = 'fGgm5ZXc6ccJTibWGXHsp0BtCRf/pQkCmKTHXrKr7Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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