Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ef5c3ddb85f66e1f2a5c05139d4c33b4c12d3f98b508bcb23d3313715a47851' 
  AND token = '+LD0sO1qDrzQ7P1hekwfoOrGW6TZ4Di7qcFbZDht9Xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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