Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '776d9241ca5f26db07bbac090ca9ade15aeadd0b9ac3d56a83c3071c551e158c' 
  AND token = 'nP31yrS3aW6iHhrXj5Dw1VPm4cmMWvc18+CER2kfgGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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