SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '087f02328dee41b1ac03d329c0bf1cffc190284c3558eca48477422c315d48b8' 
  AND token = 'hIOkIc5pgmvflAw1YDJNJzmT8HXgJ3SvOSHLJ3PfQBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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