SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f3ce601cc6eb70d54cd2f9619323e1b54af227319c0eea67c39e153a29a2b4b3' 
  AND token = 'Szke/aI4nhMELr/oSQZKCsZV87tFUVPLB/6ghy1lJpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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