SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6ff8634382b1a0468081d5b6a7999d8dfa02a2610ddcb7e0ee1bc274c02712aa' 
  AND token = 'Kt0n0GJJ4LINqoAgvH3AM9xsao5NYGsO4ai3jps5zkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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