Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16f2f8b2090deb1605fcd522a7a1a1a169667e2b275805b99d173aad4e0dcc76' 
  AND token = '6UE0CUZuhSXr/uZMraozbJzitbY0DN3IddLKRnEdeD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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