Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad3685821b8f6812f9e82cc1fc8e90aa73e845213af11ebb7bda98485a6beb1a' 
  AND token = 'hQczSak5V+CLeWnG45wiDwGnSzB6LNveFceJ3a8BbtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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