Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '506e76b1a1cd7a77d3761d6e189a1bc4987e5254963ce5902b2674dfbfff93bb' 
  AND token = '3rOWRdaPFRpo3BhD9UI9JRSJ4lRFCkb5e5Vfx3nYxq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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