SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '22790e13e97684473767c98874edb39df05aae3b14c1c1fb382e446e16736584' 
  AND token = 'YQgc9rlXozRTeqhtOMj1y/4vxFQPmAOgmZYtJfFmmm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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