SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3cc92f84d30fbfa7f5754011b37fbd23a5ed56ea5ff02ab12649bc4ca0fd6ef7' 
  AND token = 'w+ojCSfWaqxkeVJcTFC7iHvSONgBvYaIPp0snVsHtXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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