Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '012c5ec7dd8fa59af60d851a5438f75114fe4a9e3ea8d9e7cf36309604db75fb' 
  AND token = 'eRTOZSIVMCpRdi1lnU13ao2BTLTTJuR1QTh34T53VY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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