SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e72d16a8f6f1d48110b2c464a08e929e48a1222bfaa3df341991f0df2632fdd0' 
  AND token = 'I3ltT5B0caP5hiZ/92L/xzL1wOvs1CwFUTqFzXJ+xDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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