Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ab2cb6de4c60b07b7287cb6921c02e9212fe99c5e672d5d9396c1e8a4e6eda0' 
  AND token = 'O9RzoEcmMhHonALj4xtg/UttP1WGJu27idK9aRfvGkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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