SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '87cd48aabded6d5df8a06b43696d5e8bf1fd36184286146efbc7e774e5b22980' 
  AND token = 'Zjl/gcL2fd74PBadJYUHJDjxeGQaH1oOB0ENW/X+Pmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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