Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a47b7c13915beeebb51e45b0ce9a3f74c86519f5713f1dcf2c3a90513fac5847' 
  AND token = 'pH1wjuQErRzMa0/hx5ykf4q6Y+dBEVkXzW6RNptuXtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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