Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba00766c64d9b3b42beb744f0ba04d5201311cd5baf23eea68326c2d3dcb04bd' 
  AND token = '/MkYFbP2TNkVLiSF41ZKrpRQ5aiFjnq891ZSVC0Tq1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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