Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbe2ba8f7e3ef5d1e4c4c8ffe9e29749a3607fa794f7f339ea5fc55f1b7977f7' 
  AND token = 'RMzUFYomEerqFO/a4U1GOqMM/vZ241omYSz4zBITK+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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