Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0ae0a64f9368858f93baa516bd9a807cef6a94a97134916382cf92b8c7e8343' 
  AND token = 'i8nJrtKfE8lMg3o6giBjvGPujuV5m+k2CdkBjWFfBHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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