Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2146e5e7066205122529ea1b25a6bed408bbc8e9722d3d639e1ab5f8e8e3eda8' 
  AND token = '4FjBx9wSiDA9+uLVfjNzBct+FxBTyZ7+JYcluZcEkYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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