Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '435a3e43b4f48fdd21c1f5e0e7034719e9ec81ee9ab0be6477af574b27070796' 
  AND token = 'f5xmDpTXdK/w4Rzv5VkRxKaRGR/87OPUWBr+Lhnl7dQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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