Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7f7806cf2c2e9033178698fba358f5d3fe3ef537948da9065a393544a313b16' 
  AND token = 'dn7fgLTNPCvRGDYI7q+1mhu1Wxu4E8ucT/ecDAg+oBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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