Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '639c792767a808d608780ecd2f4b4a77d76d333187925caf45007bc3f67004ab' 
  AND token = 'm7Y4hx5s8F3ZUEabzpmcK+7WSsodzPKCKjlL79i+3FI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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