Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6e705ca1b0cc9ec619b602498b79e424f73948daf3d7d723edaf02241281add' 
  AND token = 'Cbzc4zyMIaMstjFkYrl5bmNj9g6gQ/S6MNsk/HoTq2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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