Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4c102c091d50c27644f36ae8af8f87e1f1f6ac49c13e6aba2d3a6decaafa6e0' 
  AND token = '8x1XOzwn9vP/8v2fBy9G1X383UfAvlHSoVs8DkEh/L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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