Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3bf9616f03f8dafdabd68e34b246c62ce655a2138fb64262a1c1c361ee9ba58' 
  AND token = 'Aj+83Taj9ov+6xiO8UJej5X+aASFEUhK80/1/pHltfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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