SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2deecfa2f7c4bccc19d750615522bf85f6b0b6498e7850930ff725fc0564d77b' 
  AND token = 'wnl9DbxiX4d/HPVjgNlq2byF0XBRAEOGHFFuqBiBIbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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