Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98398cd484ca3a6453404a0c7103fedfed8cbf6d1cc3c7625b9e02218a5c92cc' 
  AND token = 'R4AW1tAEGw27Q3Y0gMVlxGqrTTXMF/e/fUduCuPSPkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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