Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fab51bb7a69a24273c5888bbffd49c10ea7e4facadbe209a2f73978f5ad9e6d4' 
  AND token = 'QPS3XpAigOkin4q9tQRDo/MaJLJCSCOUzEkc6zkd2Gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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