SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fd847ebb213e9190219a56569805bfb022495734acb57a8127bca1a2258d8540' 
  AND token = 'wJuFwfOS/3hzT9S9r8iPTET9GKFJAlukpqbjavYay3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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