SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '32d63793b58d55f84ebdf529422823363d73b2dbf4abb04b7670bb1645ceab1d' 
  AND token = 'pjKZYWeqPPAXlbuGmeq+L09UsmmZYWruGYNViP3lc1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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