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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2aa7c5958d183445c0c1b18ff039279a9b7dd379a23709dade09439dd41f790b' 
  AND token = '019u8gK5rjYZCQxTHKlI9asQaitnzWkN/t9eCL/YWRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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