SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '44488d018eaa3553dcf3731a357979677e64ca15607b83d6c002d74bbcd694d5' 
  AND token = 'gq8MFMr5v7Jp4S6u+KyZHi67igEVsTzGLfjzuhtm7c4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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