SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd54a26fef522868b99777ed39fd53585fc1168d7eeb6979908689ef61a507dc5' 
  AND token = 'wrn/A5J01aElb78VH2upmZwVwvwQ3h+J12oo4JITRgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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