Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66f2a7e8ad52aee4ffc8a77fdbdf43d3c15271bcd92a0bc244de2a41d0a4c45b' 
  AND token = 'FYxYl+h7epymuu7GJ4n6nId38H3fJCSSmcRlQYiOam4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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