Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f40fb889dce8071909b871f1e03df756dde8ac6d186ebdeb861bb6d6068a37d3' 
  AND token = 'eMhiEXcbII4beyPv+FAWbpCR2a8Dq+wRh0LMUtOCKW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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