Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6e62f7c349d98e4ca17c6d378d6759e35cb1e8a7d61778cfe4a187eba65f0a1' 
  AND token = 'Kcgnl1H8DI9kJDMFdpjLOi20fB2Zy5uXm9fHB6HeXeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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