Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9b8f2152b40b7c9cccc56f7de999d11c8e93a09dbe3db682f6c6aca2e4a369e' 
  AND token = 'Sgir3jbPONCUwfgbbUy+pV2vzPTySYHLtgF7OoCYfO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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